In common rail engines, the fuel is_____ before is injected into the cylinders.

A . spring B . later winter C . autumn D . end of summer

A . can’t be controlled very precisely B . can’t be controlled as flexibly as the separate pump system C . can be controlled as flexibly as the separate pump system D . can be controlled more precisely and flexibly

A . incorrect adjustments B . dirty fuel C . broken fuel lines D . excessive vibratio

A . Bulbs B . Bulks C . Flyweights D . Flywheel

A . 气缸电子控制单元 B . 公共电子控制单元 C . WECS的辅助控制单元 D . 曲柄轴角度传感器

A . improper adjustment of the bypass valve B . a dribble in the fuel injection nozzle C . insufficient leak-off through injection nozzle packing D . a malfunctioning injection nozzle

A . lived on B . depended on C . lived off D . believed in

A . by injection pumps B . at a time decided by the injection pump timing C . by a signal opening the magnetic valves D . at a time decided by the cam directly

A . slow-speed diesel B . medium-speed diesel C . high-speed diesel D . constant-speed diesel

A . chemical analysis B . back pressure readings C . pyrometer readings D . infrared analysi

A . Shape of the piston crowns B . Increasing the compression ratios C . Increasing the piston crowns D . Increasing the turbocharger gear ratio

A . governor sensitivity B . governor promptness C . speed droop D . isochronous governing

A . pyrostats and a voltmeter B . a gas-filled bellows, a tube and a pressure gauge C . thermocouples and a voltmeter D . ammeters and thermocouple

A . in life jackets B . with life jackets C . with life jackets on D . putting on life jacket

A . pyrometer B . bourdon gauge C . pneumercator D . manometer

听力原文： A passenger train has slammed into a double-decker bus at a rail crossing in rural Argentina, killing eighteen people and leaving almost fifty injured. The train was traveling fiom the capital Buenos Aires to the South Atlantic beach resort of Mar del Plata (7) when the collision occurred before dawn on Sunday near Dolores, about 200 kilometers south of the capital. (8) The bus was canwing 61 passengers and 2 dryers. One of the bus passengers said the bus had tried to beat the train to the crossing, despite the train sounding its horn repeatedly as it approached. The train's drivers also told investigators that the crossing barriers were down when the bus unexpectedly tried to cross the tracks in front of the train. Where did this accident happen？ A．In the capital Buenos Aires. B．Near the beach resort of Mar del Plata. C．Near Dolores. D．Not mentioned.

A、John Milton B、John Donne C、Ben Jonson D、John Bunyan

A.chemical analysis B.back pressure readings C.pyrometer readings D.infrared analysis

The decline in degree production in what are called the STEM disciplines (science, technology, engineering, and math) seems to be 40 related to the comparatively weak performance by U.S. schoolchildren on international assessments of math and science. Many students entering college have weak skills in mathematics. According to the 2005 report of the Business-Higher Education Forum, 22 percent of college freshmen must take remedial (补习的) math 41 , and less than half of the students who plan to major in science or engineering 42 complete a major in those fields. The result has been a decrease in the number of American college graduates who have the skills, 43 in mathematics, to power a workforce that can keep the country at the forefront (前沿) of innovation and maintain its standard of living. With the 44 performance of American students in math and science has come increased competition from students from other countries that have strongly supported education in these areas. Many more students earn 45 in the STEM disciplines in developing countries than in the United States. A) accelerating B) actually C) closely D) contemporary E) courses F) critical G) declining H) degrees I) especially J) future K) led L) met M) procedures N) proportions O) spheres

A．A. John Milton B．B. John Donne C．C. John Keats D．D. John Bunyan